Lead designer Robert Cogburn said split-screen is a "technically challenging" feature; there are many "hurdles and obstacles" that would need to be overcome if the feature is ever delivered.

While Naughty Dog is interested in adding this feature to the game after launch, it was scrapped so that the team could meet the May 10 release date.

Cogburn went on to say that, as a result of the issues mentioned above, Naughty Dog is not 100 percent confident that it will ever be able to release a split-screen mode for Uncharted 4 multiplayer. That's in part why it was not mentioned in Naughty Dog's recently published DLC roadmap.

Still, Cogburn said developers at Naughty Dog are big fans of couch co-op and would like to add the feature someday, even if it takes a long time.

As for what is on Uncharted 4's DLC roadmap, Naughty Dog plans to deliver things like more maps and modes, as well as a "cinema replay" feature. All of this content will be free, though players can also spend real-world money to buy vanity items. Take a look at the roadmap in the image below.

Also during the stream today, Naughty Dog said it's considering a "classic" mode for Uncharted 4 inspired by Uncharted 2, the first game in the series to include a multiplayer. However, it's just an idea at this stage and may not be delivered. Additionally, developers said they would love to release a spectator mode for Uncharted 4, but, as with the other possible elements, Naughty Dog is not in a position to confirm anything yet.